Through qualitative analysis of mining conditions and hydrogeological feature in 17065 working face of Ruilong Mine, roof water inrush risk factors of working face recovery is that the goaf water in upper working face No. 5 coal seam may become the source of burst water, roof epigastric rock fracture development is weak to middle watery aquifer, bottom lower is strong watery Ordovician confined aquifer, with mining pressure. Fuzzy mathematics method and the water inrush coefficient method were used to analyze and calculate roof water burst dander, based on the result, the comprehensive water inrush prevention was put forward, with good result.